Parcel include: 1× Blue 4 Axis USB Mach3 control board 1× USB Cable Descriptions: Support for 4 Axis linkage, you can connect four stepper motor drives or servo drives; Maximum step-pulse frequency is 100KHz,which is suitable for the servo or stepping motor; Have 0-10V signal output,you can use mach3 software to control the spindle motor speed. One status LED, indicate connection status on the board. 4 general-purpose isolated relay drive output interface, can drive four relays for controlling the spindle starts, forward rotating and reverse rotating, pumps and other device. 4 general-purpose inputs, you can connect the limit switch, estop switch, probe , back to zero and other device.Need use external 24V DC power supply to isolate USB and external port, and to make the system more stable. Support for connecting electronic handwheel; MCU model: three generation 32-bit STM processor Communication plug-in: RnR motion control card - ECO-2.0 The output singal of theelectronic handwheel must be 5V, more than 5V output will damage the hand wheel interface. USB interface is applicable to any netbook, notebook, desktop, tablet and other PC compatible computers with USB interface. This control board does not require any drivers to be installed,as long as Mach3 can run, the control card can be used; Support computer system: Windows 2000/ XP / Windows 7/8/10 The inverter interface (AVI +, AVI-) is isolated from the computer and the main control circuit, and has strong anti-interference ability,no interference signal will be introduced due to the introduction of external strong electrical equipment. Whether frequency converter is supported: Yes Support PWM: Yes Number of control axes: X.Y.Z.A axis